Motor-control system.



No. 865,820. I I PATENTED SEPT. 10, 1907.

- 'W. J. RICHARDS.

MOTOR CONTROL SYSTEM.

APPLICATION FILED MAR. 25, 1907.

t I? 3 WWW/wee I ismvmxmy V W om aw) I O UN ITED T T WALTER .l. RICHARDS, OF NORWOOD, OHIO, ASSIGNOR TO ALLIS-OHALMERS COM CORPORATION OF NEW JERSEY.

PATENT OFFICE.

MOTOR-CONTROL SYSTEM.

To all whom it may concern: Be it known that I, WAr/rna J. RICHARDS, a citizen of the United States, residing at Norwood in the county 6r Hamilton and State of Ohio have invented certain new and useful Improvements in Motor-Control Systoms, of which the following is a full, clear, and exact specification.

My invention relates to motor control systems. i It has been found that one of the most effective methods of controlling the speed of an electric motor is by chines, separately excited field windings therefor connectcd in' series, and means whereby a variable part of the current which traverses the field winding of one of said machir 5 may be shunted around thcfield winding of another of said machines.

description and drawing and will be. particularly pointed out in the claims.

'Figure 1 shows diagrammatically one embodiment of my invention; and Fig. 2 is a simple connection diagram illustrating the principle of my invention.

The armatureA of a generator supplies the armature B of a motor. The generator may be driven from any desired source and the motor may be used to do any desired work, such, for instance, as operating rolling mills'or hoisting machinery. The field windings a and b of the generator and motorrespectively are connected in series with each other and supplied with current from any desired source through a switch 4. The armature O of an auxiliary dynamo-electric machine, driven 'from any desired souigce, is connected across the field winding a. The movable arm 5 ofa controller D, as it Specification of Letters Patent.

Application filed March 25. 1907. Serial No. 364.230.

Other features of my invention will appear from the Patented Sept. 10, 1907;

passes through its vertical position, reverses the connections of the field winding a. The arm 5 also varies the amount of the resistance 6 in circuit with the field winding 0 of the auxiliary generator, thus varying the clectromotive force of said generator. The resistance 6 is provided with two sets of contacts connected by cross connections 7, so that saidresistance is cut out of circuit as arm 5 is moved in either direction from the vertical.

With the switch 4 closed and the arm 5 in its vertical or off position, the field winding (1 and the armature O are preferably short-circuited and thefield winding 1) supplied with the full potential of the auxiliary source of supply. However, as the circuit of the field winding c is incomplete the armature G generates no elcctromotivc force and its being short-circuited does no damage. As the arm 5 is moved in either direction from the vertical it first breaks the short-circuit around the field winding a and armature C to connect said field PANY, 4.

winding and said armature in shunt to each other and in series with the field winding 1). As the armature C i has a very low and almost inappreciable resistance as compared to the field winding (1, it carries nearly all of the current which is supplied to the field winding b leaving very little to flow in the field winding a. The generator A new generates a very small electromotive force which it impresses on the motor armature B. The arm 5 next completes the circuit of the field winding 0 through the entire resistance 6, thus causing the auxiliary generator to generate a small el-ectromotive force. The generator 0 is so connected that this electromotive force is in the opposite direction to the electromotive iorco imprcssed on its armature so that the armature" 0 offers increased opposition to the how of current through it and thus throws more current through the generatorrield winding (1. This increases the electromotive force of the generator armature A so that it impresses a higher electromotive force on the motor armature'B As the arm 5is moved farther from the vertical toward the horizontal the resistance 6 is gradually cut out of circuit, thus increasing the strength of the field winding 0 and the counter electromotive force oi the armature G to throw more and more current through the field-Winding a. This gradually increases the field strengthand therefore the electromotive" force of the generator and impresses a gradually? increasing electromotive force on the motor armature B. The latter starts assoon as the electromotive force impressed thereon is sullicient and increases in speed with further increases in its impressed electromotive force. The

increase in the counter electromotive force of the arms ture C, besides increasing the voltage across the field winding a, decreases the voltage across the field winding b, thus weakening the motor field to aasist in increasing the H1?t0r speed.

and B and the direction of rotation of the motor.

As the arm is moved backward from the horizontal toward the vertical the reverse of the cycle of operations above described takes place, and the motor B is allowed to slow down. The operation is the same for movement of the arm 5 on either side of its vertical position, the only difference"being that the direction of the current. in the field winding (1 is reversed, thus reversing the direction oi current in the armaturcs A In Fig. 2 the reversing switch for the field winding a is omitted for the sake of simplicity and the arm 5 is shown as merely varying the amount. of the resistance 6 in circuit with the field winding c.

lliany modifications in the precise arrangement here shown and described may be made without departing from the spirit and scope of my invenl ion, and all such I aim to cover in the following claims.

What 1 claim as new is:-

i. In combination. a plurality of dynamo electric ma chines. separately excited field windings therefor connected in set *s. and means whereby a variable part of the current which traverses the field winding of one of saidmachines may lie shunted around the field winding of another of said machines.

2., In combination. a plurality of dynamo-electric ma chines, separately excited field windings therefor connected in ies, means whereby a variable part of the current' which traverses the field winding of one of said machines may he shunted around the iicld winding of another of said :hincs. and means for reversing; the connections of the field winding of one of said machines.

I). in combination. a plurality of dynamo-electric ma chines separately excited field windings therefor connected in ser means whereby a variable part of the current which traverses the hold winding of one of said machines may be shunted around the field winding of another of said machines. and means for reversing the connections f the shunted field winding.

4. in combination. a plurality of dynamo-electric machines, separately excited field windings therefor connected in series, and a source of elccrromotivc force in shunt to one of said field windings.

in combination, a plurality of dynamociectric Inachines, separately excited field windings therefor connected in series, a source of eleciromotive force in shunt to one of said field windings, and means for varying the electri motive force of said source.

6. In combination. a plurality of dynamo-electric machines, separately ex ifed field windings therefor connected in series, and an auxiliary dynamo-electric machine the armature of which is connected across one of saidfield windings.

T. In combination, a plurality of dynamo-electric ma chines, separately excited field windings therefor connected in s'erics, an auxiliary dynamo-electric machine the armu ture of which is connected across one of said field windings, and means for varying the elcctromotive force of Said auxiliary dynamo-electric machine.

)5. in combination, a plurality of dynamo-electric machines, separately excited field windings therefor connected in series, an auxiliary dynamo-electric machine the armature of which is connected across one of said field windings, and mca'ns for varying the clectromotive force of said auxiliary dynamo-electric machine and for rcvcrsim, the connections of one of said field windings.

i). In combination, a plurality of dynainoclcctric machines, separately excited field windings therefor connected in series, an auxiliary dynamo-electric machine the armature of which is connected across one of said field windings, and means for varying the electromoive force of said auxiliary dynamo-electric machine and for reversing the connections of the field winding across which the auxiliary dynamo-electric machine is connector].

10. A motor control system, comprising a, motor, a generator supplying the armature thereof, separately excited field windings for said generator and said motor connected in series with each other, and means tor shunting one of said field windings.

11. A motor control system, comprising a motor, a generator supplying the armature thereof, separately excited field windings for said generator and said motor connected in series with each other, and means or variably shunting one ot said field windings.

12. A motor control system, comprising a motor, a generator supplying the armature thereof, separately excited fieldavindings for said generator and said motor connected in series with each other, and means for shunting one of said field windings and for reversing the connections of one of said field windings.

15%. A motor control system, comprising a motor, a generator supplying the armature thereof, separately excited field windings for said generator and said motor con nccted in series with each other, and means-for shunting one of said field windings and for reversing the conned tions of the shunted field winding.

l-i. A motor control s rem, comprising a motor, a generator supplying the armature oi said motor, separately excited field windings for said generator and said motor connected in series with each other, and a source of electromotive force-connected across one of said field winding's.

15. A motor control system, comprising a motor, a generator supplying the armature of said motor. separately excited field windings for said generator and said motor connected in series with each other, an auxiliary dynamoelcctric machine the armature of. which is connected in shunt to one of said field windings, and means (or varying the clcctromotlve force of said auxiliary machine.

iii. A motor control system, comprising a motor, a' zcuerator supplying the armature of said motor, separately excited ficld windings for said generator and said motor connected in series with each other, an auxiliary dynamoclcctric machine connected across one of said field windlugs, and means for reversing the connections of one of said field windings.

17. A motor control s stem. comprising a motor, a acneratoi supplying the armature of said motor, separately excited field windings [or said generator and said motor connected in series with each other. a sourciof electromotivc torcc connected in shunt to one of said field windings. and means for reversing the connections of said shunted licld winding.

18. motor control system. comprising a motor. a generator supplying the armature of said motor, separately excited field windings for said generator and said motor connected in series with each other, a source oi? clcctromotive force connected across one of said field windings, and means for var mg the electromotlvc force of said source and for reversing the connections of one of said ticld windings.

ii). A motor control system, comprisinr a motor. a gencrator supplying the armature of said motor, separately excited field windings for said generator and said motor connected in series with each Other, an auxili: dynamw electric machine connected in shunt to one of said field windings. and means for varying; the clectromotivc force of said auxiliary machine and for reversing the connections of said shunted field winding.

.20. motor control system, comprising a motor, a generator supplying the armature of said motor. field windings for-said generator and said motor connected in series with each other, and an auxiliary dynamo-elcctric machine the armature of which is connected in shunt: to one of said ticld windings.

21. A motor control system, comprising a motor, a generator supplying the armature of said motor, field windings for said generator and said motor connected in series wirhn-ach other, an auxiliary dynamo-electric machine connected across one of said field windings, and means for varying the clcctromotive force of said auxiliary machine.

2 motor control system, comprising a. motor, a genorator supplyim. the armature of said motor, field windings for said generator and said motor connected in series with each other, a source of electromotive force connected in shunt to one of said field windings, and means for reversing the connections of one of said field windings.

23. A motor control system, comprising a motor, a gem eratorjsupplying the armature of said motor, field windings for said generator and said motor connected in series with each'other, a source of electromotive force connected across one of said field windings, and means for reversing the connections oi." that field winding across which said source of electromotive force is connected.

24. A motor control system, comprising a motor, a gen' 'erator supplying the armature of said motor, field wind lugs for said generator and said motor connected in series with each other, an auxiliary dynamo-electric machine connected in shunt to one of said field windings, and means for varying the electromotive force of said auxiliary machine and for reversing the connections of one of said field windings.

25. A motor control systemfcomprlsing a motor, a. generator supplying the armature oi. said motor, field windings for said generatorand said motor connected in series with each other, an auxiliary dynamo-electric machine the armature of which is connected across one of .said field windings, and means for varying the electromotive force of said auxiliary machine and for reversing-the conned tions of that field winding across which said armature is connected.

26. A motor control system, comprising a motor, a gen-. orator supplying the armature of said motor, separately excited field windings for said generator and said motor connected in series with'each other, and an auxiliary dynamo-electric machineconnected across the field winding of the generator. v

27. A motor control system, comprising a. motor, a generator supplying the armature of said motor, separately excited field windings for saidgenerator and said motor connected in series with eachpther, a .sourcepf electromotive force connected in shunt to the field winding of the generator, and means for varying the electromotive. force of said source.

28. A motor control system, comprising a motor, a generator supplying the armature'of saidmotor, separately excited field windings for said generator and said motor connected in series wlth\each'other', a source of electromotive force connected across the field winding of the generator, and means for reyersingthe connections of field winding of one of said machines.

21). A motor control system, comprising a motor, a generator supplying the armature of said motor, separately excited field windings for said generator and said motor connected in series with each other, an auxiliary dynamoelectric machine connected in shunt to the fleldwinding of. the generator, and means for reversing 'the connections of the generator field winding.

30. A motor control system, comprising a main motor, a main generator supplying the armature of said motor, separately excited field windings for said generator and said motor connecte in series with each other, an auxiliary dynamo-elcctri e machine the armature of which isconnectedneross the field winding of saldmain generator, and-means for varying the electromotive force of said auxiliary machine'and'jfor reversing thewonnections of the iicld winding of one of said main machines. 7 V

31. A motor control system, comprising. motor, 11 generator supplying the armatdre ofsaid' motor, separately excited field windings for said generator and said motor connected in se'rie's'with each other, a source of electromotive force connected in shunt to the field winding of the generator, and means for varying the elcctromotlve force of said source and for reversing the connections of the generator field winding. r

32. A motor control system; comprising, a motor, a generator supplying the armature of 5mm motor, field windinns for said generator and said motor connected in series with each other, ands source of electromotive force con nccted in shunt to the field winding of the generator.

253. A motor control system, comprising a motor, a generator supplying the armature of said motor, field wind: lugs for said generator and said motor connected in series \vitlLeach other, a source of elcctromotive force connected .ncross the field. winding of the. generator, and means for varying the eleciromotive force of said source.

34; A motor control system, comprising a mnin motor, a main generator supplying the armature of said motor, field windings of said generator and said motor connected in series with each other, an auxiliary dynamo-electric machine the armature of which is connected in shunt to the tield winding of said main generator, and means for said main machines.

35. A motor control system, comprising a motor a generator supplying the armature 'of'said motor, field'wind-- lugs for said generator and said motor connected in series with each other, an auxiliary dynamo-eiectric machlndthe armature of which is connected across the field winding of the generator, and means for reversing the connections of the generator field winding.

36. A motor control system, comprising a motor, a genx. orator supplying the armature of said motor, field wind ings for said generator and said motor connected in series with each other, a source of electromotive force connected in shunt to the field winding of the generator, and means for varying the electromotive force of said source and for f reversing the connections of the field winding 0! one of said machines. Y f

37. A motor control system, comprising a motor, a-genorator supplying the armature of said motor, field wind lugs for said generator and. said motor connected in series with each other, a source of electromotive force connected across the field winding of the generator, and means for varying the electromotive force of said source and for reverslng the connections of the generator field winding.

38. In combination, a plurality of dynamo-electric maconnected in series, .a shunt around one of said field windings, and a source of variable electromotiv force for vary ing the relative amounts of current through said shunt and the shunted field winding.

39. A system of motor control, comprising a motor, 1,115 generator, supplying the armature thereof, separately e xcited field windings for said motor and said generator connected in series with each other, a shunt around thefield electromotive force for varying the relative amounts of current through said shunt and the shunted field winding.

-10. A system oi motor control, comprising a motor; a generator supplying the armature thereof, separately excited field windingsfor said motor and said generator connected in series with each other, a shunt around the field winding" of the generator, and a source of variable electromotive force for varying the relative amounts of current through said shunt and the generator field winding.

41. In combi ation, a plurality. of dynamo-electric machines, field windings for said machines connected in series, a shnnt around one of said field windings, and a source of variable electromol'ive torce io r varying the relative amounts of current through said shunt and the shunted field winding. I

42 tem oi motor control, comprising a motora generat l supplying the armature thereof, field windings for suiduuotor and said generator connected in-scries with varying the relative amounts of c shunt and the generator field winding.

1 in testimon whereof I uliix my signature, in the pres once of ,two witnesses.

.1. RICHARDS.

Witnesses I Giro. B. Scunur,

Flu-2o .T. Kinsle reversing the connections of the field winding of one of 85 chines, separately excited field windings for said machines 110 v winding of one of said machines,'and a source of variable l j 

